From cb028e49129f352d2f2645727ceeeacdd64761f4 Mon Sep 17 00:00:00 2001 From: Douglas Anderson Date: Thu, 25 Oct 2018 15:21:29 -0700 Subject: dt-bindings: drm/panel: simple: Add no-hpd property Some eDP panels that are designed to be always connected to a board use their HPD signal to signal that they've finished powering on and they're ready to be talked to. However, for various reasons it's possible that the HPD signal from the panel isn't actually hooked up. In the case where the HPD isn't hooked up you can look at the timing diagram on the panel datasheet and insert a delay for the maximum amount of time that the HPD might take to come up. Let's add a property in the device tree for this concept. Reviewed-by: Sean Paul Reviewed-by: Rob Herring Signed-off-by: Douglas Anderson Signed-off-by: Sean Paul Link: https://patchwork.freedesktop.org/patch/msgid/20181025222134.174583-1-dianders@chromium.org --- Documentation/devicetree/bindings/display/panel/simple-panel.txt | 3 +++ 1 file changed, 3 insertions(+) (limited to 'Documentation') diff --git a/Documentation/devicetree/bindings/display/panel/simple-panel.txt b/Documentation/devicetree/bindings/display/panel/simple-panel.txt index 45a457ad38f0..b2b872c710f2 100644 --- a/Documentation/devicetree/bindings/display/panel/simple-panel.txt +++ b/Documentation/devicetree/bindings/display/panel/simple-panel.txt @@ -11,6 +11,9 @@ Optional properties: - ddc-i2c-bus: phandle of an I2C controller used for DDC EDID probing - enable-gpios: GPIO pin to enable or disable the panel - backlight: phandle of the backlight device attached to the panel +- no-hpd: This panel is supposed to communicate that it's ready via HPD + (hot plug detect) signal, but the signal isn't hooked up so we should + hardcode the max delay from the panel spec when powering up the panel. Example: -- cgit v1.2.3-59-g8ed1b